Pump



June 10, 1930. F. H. PAATSCH PUMP Fi1ed April 28, 1928 supported in asuitable bearing 10.

Patented June 10, 1930 UNITED STATES PATENT OFFICE FRANK H. PAA'ISCH, OFWA'UWA'IOSA, WISGONSIN, ASSIGNOR T0 ALLIS-CHALMERS MANUFAGTURINGGOMIANY, OF MILWA'UKEE, WISCONSIN, A COBIPORATION DIE DELAWABE FUJI?Application flled April 28,

The present invention relates in general to improvements in hydraulicmachines, aud relates more specifically Co improvements m theconstruction und operation of rotary pumps especially adapted to operateupon relatively heavy fiuids 01 liquide conta1mng solid matter insuspension.

An object 0f the invention is to p1ov1de a centrifugal pump for handlingliquids baying solid substances in suspensi on, v vhmh 1s simple inconS-uction .and efl'1c1ent m operation. Another object of the invention1s to provide a rotary pump which will no t clog due to the presence ofs01'1d partic1es 111 the liquid passing through the pump retor. furtherobject of the invention is to promde a compact pump structure whereinthe parts which are subjected to excessiVe wear may be readily replaced.Still another ob ect of the invention is to provide an improved rotorfor centrif'ugal umps er the like. These and other ob eets andadvantages will'appear from the following description.

A c1ear concept1on of an embodiment of the invention und 0f the mannerin which devices constructed in ccordance therewith are adapted tooperate,. may be had by referring t0 the drawing accompanyirxg a ndforming a part of this specification in wh1ch 1ike reference charactersdesignate the same 01 similar parts in the seve ral views.

Fig. 1 is a longitudinal vertical section through a centrifugal pumstruc ture, showing the pump impeller in e evation.

Fim 2 is an end view o1 the improved pump impe 1er.

Fig. 3 is a perspective view of the imProved pump impeller.

The centrifugal pump shown in detail in I: Fig. 1, comprises in generala casing cousisting of a lower o1 base section 3, und an upper er coversection 4 cooperating therewith to form a rotor 2 which is carried by amain sha%h9 e pump casing is provided at one end with a. tubularexte1'1sion which forms a suction pas sage 7 disposed coaxial with theroter 2.

Located within the casing sections 3, 4 is a sei; of annular ]iners 5,6, euch of which is housing for the impeller or 1928. Serial N0.273,506.

formed es a single complete ring held in place by the assembled casingsections 3, 4,

8 which form a spiral delivery eonduit in open communication with theperipheral discharge openings of the impeller 2. The main shaft 9 may beconnected to any suitable driv- A ing means'such as an electric motor 01a pulley, and extends into the pump casing through a suitable stuflingbox er packing 17 coacting with the base and cover sections 3, 4.

The improved impeller er roter 2 forming an important Part 0f thepresent invention, comprises a conical hub 11 and a pair ofdiametrically opposite vanes euch of which extends spirall y about thehub. The inlet edges 12 0f the vanes diverge away from the hub and fromthe rotor axis, in ordet to provide an unobstructed axial suctionopening leading into the impeller. The spiral fluid impelling surfacesof the vanes, are laterally inglined relative 130 the axis 0f the rot orad- ]oining the inlet edges 12, and gradually ap proach axialparallelism at the discharge portions 13 of the vanes. The vanedischarge portions 13 are connected to the comical central hub 11 bymeans of end walls 14 located remote from the Suction side of theimpeller, und. the conical hub 11 has a bored projection 18 which isrigidlv attached to the end of the mein shaft 9. 'Ihe formation of theimpeller vanes is such that one side of the rotor is entirely open andthe suction opening is free from obstruction, and is also such that theentering material is gradually deflected from axial flow to outwa1d flowby the spiral vane surfaces, without perinitting any of the material tocling to the impe1ler structure. While the vanes 013 the-rotor 2 aredisclosed as extending about the impeller axis,

materially reduced in some cases.

During norm*al operation of the pump the impeller 2 is rotated by meansof the main shaft 9 in a counter-clockwise direction as viewed in Fig.2, and the rotating spiral vanes cause the fluid to enter the suctionopening from the inlet passage 7 and to travel along the internalsurfaces of the impeller vanes until it is eventually delivered from thedischarge portions 18 t-o the spiral discharge conduit 8. By virtue ofthe divergence of the inlet edge 12 ancl of the adjoining guidingsurfaces of the vanes, solids which may be suspended in the liquid beingpumped, are prevented from clinging to theyrotor and thereby cloggingthe suction opening. Any solids entering the pump, quickly pass ihroughthe impeller passages, and are delivered from the roter 2 throughrelatively Wide openings at the periphery f the rotating structure. Thefluid thus delivered from the roter t0 the conduit 8 is discharged underpressure from the final discharge opening of the casing.

It Will be noted that by utilizing only two J Vanes ancl by causingthese vanes t0 extend spirall v about the hub and about the impelleraxis a comi aratively great distance, relativel v long impellingsurfaces adapted to gradually change the direction of flow from axial t0radial, are provided. The impeller by virtue .of its formation with oneside completely open, may be readily constructed and machined to providesmooth surfaces for the vanes. The wearing plates 5, 6 cooperate withthe sides of the rotor 2 to provide for proper confinement of the liquidbeing pumped, and the inleteye produced by the flange 16 of the plate 6insures delivery of t-he fluid to the pump impeller without permittingparticles to lodge ab the relatively moving sealing surfaces. Theformation of the inlet edges 12 of the vanes also provide a relativelyunobstructed suction opening within the rotor, thereby positivelyeliminating danger 0f clogging. The liner plates 6 are readily removableby virtue 0f the sectional construction of the pump casing and areefi'ectively retained in normal position by the annular projections 15cooperating With tl1e cnsing recesses. These liner plates by virtue 0ftheir ring structure also tend to eliminate clogging by presentingsmooth annular guiding surfaces, and additionally enhance the rigidityof the pump structure. Pumps constructed in accordance with the presentinvention have been producing efliciencies of over per centwider thesevere conditions of operation, without clogging.

It shoulol be understood that it is not desired to l-imit the inventionto the exact details of construetion herein shown and described, forvarious modifications within the scope of the claims may occur topersons skilled in the art.

It is qlaimed and. desired to secure by Letters Patent:

1. A pump impellercomprising, a conical hub, and vanes extendingspirally along and about the axis 0f said hub, the inlet edges of saidvanes extending spirally and outwardly away from the smaller end of saidhub 120 provide an unobstructed axial suction opening in advance of thehub apex, and the spiral fluid impelling surfaces of said vanes beinglaterally inclined relative to said axis adjoining said edges andgradually approaching axial parallelism ab the discharge portionthereof.

2. A pump impeller comprising, a conical hub, and a pair ofdiametrically opposite vanes each extending spirally and outwardly awayfrom the smaller encl of said hub to provicle an unobstructed axialsuction opening in advance of the hub apex, and the spiral fluidimpelling surfaces of said vanes being laterally inclined relative t0said axis adjoining said edges and gradually approaching axialparallelism at the discharge portion thereof.

3. In a pump, a rotary conical hub, vanes rotatable with and extendingspirally along and about the axis of said hub to form an impeller, theinlet edges ofSaid vanes extending spirally and outwardly away from thesmaller end of said hub to provide an unobstructed axial suction openingwithin said impeller and in a'dvance of the hub ape x and the spiralfluid impelling surfaces of said vanes being laterally inclined relative130 said axis adjoining said edges and gradually approaching axialparallelism at the discharge portions thereof, a casing enclosing saidimpeller and having a suction Opening communicating therewith, and astationary renewable side plate secured to said casing and cooperatingwith said impeller to provide an unobstructed opening of less diameterthan the suction opening of said casing communicating direaz{zly wi thtl1e suction Opening of said impe er.

In testimony vyhereof, the signature of the inventor is aflixed hereto.

FRANK H. PAATSCH.

